phototransduction
... No rods or cons >>>not sensitive to light. It is the optic nerve head Blood vessels enter & leave the eye at this point. Overlap of two visual field>>cannot notice it ...
... No rods or cons >>>not sensitive to light. It is the optic nerve head Blood vessels enter & leave the eye at this point. Overlap of two visual field>>cannot notice it ...
Retinitis Pigmentosa
... daylight, in colour and in fine detail. It is the macular that is used for reading, writing, and detailed close work and recognising faces – in other words, our central vision. Rods are found in the peripheral retina and are good at ‘seeing’ things that move, are in the dark but they only see in bla ...
... daylight, in colour and in fine detail. It is the macular that is used for reading, writing, and detailed close work and recognising faces – in other words, our central vision. Rods are found in the peripheral retina and are good at ‘seeing’ things that move, are in the dark but they only see in bla ...
BIOL 116T
... b. light stimulation may be breaking down cGMP which causes Na+ channels to close ---> stops glutamic acid secretion by rod cell c. glutamic acid stimulates or inhibits bipolar cells (2 types) C. Cones 1. require more light 2. color vision blue, green, red cones (wavelength specific) 3. retinal not ...
... b. light stimulation may be breaking down cGMP which causes Na+ channels to close ---> stops glutamic acid secretion by rod cell c. glutamic acid stimulates or inhibits bipolar cells (2 types) C. Cones 1. require more light 2. color vision blue, green, red cones (wavelength specific) 3. retinal not ...
Study questions - (canvas.brown.edu).
... T F 6. In the cat retina, ganglion cells of the X-cell class have smaller receptive fields and more tonic (sustained) light responses that do Y cells. T F 7. The ON and OFF channels of the retina can be traced to two different classes of bipolar cells with opposing responses to the photoreceptor tra ...
... T F 6. In the cat retina, ganglion cells of the X-cell class have smaller receptive fields and more tonic (sustained) light responses that do Y cells. T F 7. The ON and OFF channels of the retina can be traced to two different classes of bipolar cells with opposing responses to the photoreceptor tra ...
Retina
The retina (/ˈrɛtɪnə/ RET-i-nə, pl. retinae, /ˈrɛtiniː/; from Latin rēte, meaning ""net"") is the third and inner coat of the eye which is a light-sensitive layer of tissue. The optics of the eye create an image of the visual world on the retina (through the cornea and lens), which serves much the same function as the film in a camera. Light striking the retina initiates a cascade of chemical and electrical events that ultimately trigger nerve impulses. These are sent to various visual centres of the brain through the fibres of the optic nerve.In vertebrate embryonic development, the retina and the optic nerve originate as outgrowths of the developing brain, so the retina is considered part of the central nervous system (CNS) and is actually brain tissue. It is the only part of the CNS that can be visualized non-invasively.The retina is a layered structure with several layers of neurons interconnected by synapses. The only neurons that are directly sensitive to light are the photoreceptor cells. These are mainly of two types: the rods and cones. Rods function mainly in dim light and provide black-and-white vision, while cones support daytime vision and the perception of colour. A third, much rarer type of photoreceptor, the intrinsically photosensitive ganglion cell, is important for reflexive responses to bright daylight.Neural signals from the rods and cones undergo processing by other neurons of the retina. The output takes the form of action potentials in retinal ganglion cells whose axons form the optic nerve. Several important features of visual perception can be traced to the retinal encoding and processing of light.